A) \[\frac{\rho }{\rho -\sigma }\]
B) \[\frac{\rho -\sigma }{\rho }\]
C) \[\frac{\rho }{\rho +\sigma }\]
D) \[\frac{\rho +\sigma }{\rho }\]
Correct Answer: A
Solution :
\[{{E}_{r}}=\frac{{{F}_{a}}}{{{F}_{m}}}\] \[=\frac{mg}{(m-{{m}_{1}})g}=\frac{\rho V}{(\rho -\sigma )V}=\frac{\rho }{(\rho -\sigma )}\]
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